Electric fuse



,Nov. 4, 1924,

H. T. BUSSMANN ELECTRI C FUSE Filed May 7, 1919 Patented Nov. 4, 1924.

HENRY T. BUSSMANN, 0F ST. LOUIS. MISSOURI.

ELECTRIC FUSE.

.Application filed May 17,

To rtl-l', arf/ 0 m .it .fmt/ly @officer/1i Be utvhire-nin ithat. l, HENRY T. Hrssivrany, a cilinen oit the llsnirted `States, ,residang ,at

St. ilaouis, Missouri, lhave invented .a eertain kneet am; fleet-nic Fuiste. oli which the il'oflloz iis :a lil, clear. :and ena-et deseriip tion, `suola as nilll Aenable others Askrl led in `the aait to .make and use .fthe same.

invention relates to electric rises and refers lvuanticulrarly to that ftyipe ot' known as the reiillable :cartridge t'use; yet l do not limit my havent-fion lWholly sto type aas yoer-takin yof my imp-r'orements are li'kewise vdesirable in other tyipes @of iuses.

The object of my invention is to piroyide a fuse that fis 7simple in construction, can be 'manufactured Aat .a :low cost Aand can be easily renewed.

ln the drawings, Fig. 1 shows `my fuse, a portion (being .broken out'zto illustrate the interior thereof. Fig. 2 is a side View :ef the member attached to the end of the casing. an inside end -yiew ot this member, indicating by dotted lines the terminal fitted therein. Fig. 4 is an outside end View ot this member. Fig. 5 is a View similar to Fig. 1 With the fuse at an angle of ninety degrees from the position there shown. Fig. (S is a View ot the fuse link shown in Fig. 1.

In the drawings, 6 is a casing. T is a member, preferably of metal, attached to the casing in any suitable manner, as, for example, rivets 8. 9 is a shoulder on the member, shaped to tit snugly into cap 10.

It is Well known that ber, which is principally used as a casing, will Wear Very easily, and that it will shrink and swell. 1V here the cap or closure sets directly on such fiber casing, there is no assurance that a tight iit Will be obtained and that such tight ht will be maintained. rlhe shrinking ot the liber permits the escape oit gas and flame on the blowing oll the tuse. The swelling of the iber prevents the re moral ol" the cap. For this reason l arrange the out-side portion ot' element 7, so that the cap 10 will lit closely over it. thereby preventing the escape ot' Haine and gases on the blowing ot' the 'fuse and at the same time permitting easy removal ot' the cap.

The member 7 is provided Withtwo or more projections 11. as shown in Figs. 2 and P3, that extend within the casing. The space between these projections is oll such a dimension as toit the terminal 12 closely and 191D. Serial No. 295,371.

still perinirtready removal 'and insertion of the terminal .so :that the tei I.11i-nal is held :against rotational and siden'ise movenlient. One ot these iiin'efrnbws 7 is placed on each fend ait the :casing *mi f1 the sparV bet-Ween the Vprojections properly positioned, .so that .the terminals :are -`rheld :in fthe same plane.

llt will be rea understood by those "yersed in `the art *that the arrranm.ment ycan :be 'readily yused iin fuses khaving `other methods for holding .the -elosure in place than that here shown.

To terminals 12 :are detaohahly 'connected fuse strip .13, by Iany ans, for example.y .bolts 14. 15 Ashows projections `on the fuse link, preferably@ stamped out so to hold the vstrip in predetermined faligfnnien'. This prevents the lin-Sk from being pulled out ot' line with the `tuse strip When 'the rbolts let are pulled up tight. i

Through' holes 16 .in the member 7 and through opening 17 in terminals 12, is passed a bolt 18, which is hel-d in place by vthe nut 19, or any other means, such as threads in the member. It is obvious that l may use such holding means on a member attached to the outside of the casing.

It Will be noted that l have shown the opening 17 in the terminal ot a length greater than the diameter ot' the bolt that passes therethrough. This is done to overcome the Variation in length ot the assembled terminals and fuse link, which variation is due to the clearance necessary in the bolt holes in the copper terminals and 'fuse link, and the Variations in the lengt-h of the structure, comprising the casing and closures.

In manufacturing my fuse, l may make either the holes 16 in the member 7, or the opening 17 in terminal 12, or all of them, oi" a length greater than the diameter ot the bolt used. This arrangement may be provided on the part or parts :it one end oit the fuse only, but to preserve uniformity ot parts I prefer that both ends ot' the fuse be alike. There the variations referred to are eliminated, or Where other means tor taking care ot' these variations are provided, l may make these holes only long enough to pass fthe bolt 18 therethrough.

I claim as my invention:

1. ln a retillable fuse, a casing, a inember extending Within the casing and posin tioned therein, a terminal having an opening therein extending Within the member, a

cap and a unitarymeans for detachably positioning the cap and the terminal.

2. In a retillable fuse, a casing, a ringshaped member, means for attaching the member to the casing, a terminal extending Within the casing, a cap, detachable holding means connecting the cap to themember and positioned in an aperture in the terminal, said aperture being of a size as to allow a certain limited movement of the terminal relative to the detachable holding means.

3. In a relillable fuse, the combination of a casing, a yring shaped member, a terminal extending into said member, a cap, detachable holding means vextending through Spaces in cap,'element and terminal, Which spaces in said terminal have a substantial clearance toy allow a certain limited movef menty of the-terminal relative to the holding means. v j

4L. In a refillable fuse, a casing, a ring shaped member fastened to the-casing, a cap, a terminal extending Within the casing, detachable fastening means extending through an opening in the member and en gaging the terminal, the opening in the member having a substantial clearance to allow a certain limited movement of the terminal relative to the detachable fastening means.

5. In a refillable fuse, a casing, a cap, a

outside the casing for holding the closure.

7. In a reiillable fuse, a Casing, a member having projections extending Withi'nthe casing, a flat blade-terminal adapted to be passed through the member; the projections on the member providing oppositely disposedl recesses to position the terminal against rotational and sideWise movement.

8. In a rellable fuse, a casing, a cap,

`a ring shaped member attached to the casing, holding means extending transversely through the portion of the member beyond the casing for detachably holding the cap.

9. In a rellable fuse, acasing, a closure, a vstructure comprising terminals and a fuse link and means on the fuse link for engaging the sides of the terminals to establish and maintain the structure in alignment.

HENRY T.` BUssMANN. 

